I need clarity and context on the following which is said by Ibn Abbas (RA):
“Ibn Abbas recited this verse as ‘أَفَلَمْ يتبين ٱلَّذِينَ’. He was told that it is ‘أَفَلَمْ يَا۟يْـَٔسِ ٱلَّذِينَ’ to which Ibn Abbas replied: “The writer has written يَا۟يْـَٔسِ but I think that he may not have been wakeful at that time of writing this word.”
Al Itqan fi Uloom al Quran, Volume 1 page 238
The same is said elsewhere:
وأخرج ابن جرير وابن الأنباري في المصاحف، عن ابن عباس – رضي الله عنهما – أنه قرأ [أفلم يتبين الذين آمنوا] فقيل له: إنها في المصحف { أفلم ييأس } فقال: أظن الكاتب كتبها وهو ناعس.
Ibn Jarir and Ibn al-Anbari included in the musahif on the authority of Ibn Abbas – may God be pleased with them – that he read {are those who believe clearly aware} and it was said to him: It is in the Qur’an: “do not those who believe despair.” So he said: I think the writer wrote it while he was drowsy
Ibn Hajar said on it's chain:
وروى الطبري وعبد بن حميد بإسناد صحيح كلهم من رجال البخاري عن ابن عباس أنه كان يقرؤها ” أفلم يتبين” ويقول: كتبها الكاتب وهو ناعس
And Tabari and Abd bin Hamid narrated with a Sahih chain containing all the narrators from the rijal of Bukhari, from Ibn Abbas that he recited “ أفلم يتبين” and said that the writer had written it [يَا۟يْـَٔسِ] when he was drowsy.
Fath al Bari, Volume 8 page 373
Was Ibn Abbas simply mistaken here?